import { _PdfDecodeStream } from '../decode-stream';
/**
 * Provides an LZW decoding stream that expands LZW compressed data from the underlying stream.
 *
 * @private
 */
export declare class _PdfLempelZivWelchStream extends _PdfDecodeStream {
    stream: any;
    private cachedData;
    private bitsCached;
    private lzwState;
    private lastCode;
    constructor(str: any, maybeLength?: number, earlyChange?: number);
    readBits(n: number): number;
    readBlock(): void;
}